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June 9, 1931. R A WALKER 1,809,005 AUTOMATIC DRAFT REGULATOR Filed Oct.ll. 1929 Patented June 9, 1931 UNITED- s'ra'r'es PATENT OFFICE RICHARDA. WALKER, OF Sil?. JOSEPHfMISSURI, ASSIGNOR TO MANUFAC- TUBING OOIPANY,F ST. JOSEPH, MISSOURI, A. CORPORATION OF MISSOURI Auromrrc DRAFTREGULATOR Appucuon mea october 11, 1929. serial No. 399,000.

` a regulator which may be rea ily attached to and detached from a pipeline without dis'- turhing vor taking down that line; whichwill respondautomatically to pull or draft in the pipe I and readily adjusted tovary the resistance of the damper orshutter to the draft set up in theline.

In order that the invention may be clear to those skilled in the art,there is shown in the accompanying `drav'viugs two embodiments of thesame, but insofar as they may be modified Within the skill of a mechanicwithout departing from the principle thereof, it is4 to be understoodthat they are within the scope of this invention, and the drawings aremerely illustrative, and'in no sense restrictive, thereof. 1

In the drawings Figure 1 is a side view 'of so much of a pipe as isnecessa to illustrate my invention, with the re ator applied thereto,

Figure 2 is a view looking from the right,

Fi e1 Y Fiu- 3 is a horizontalsection on sub I stantiallythe line 3 3,Figure 1, looking in the direction of the arrows,

Figure 4 is a vertlcal sectlonal view of the 'forward end of the stubpipe in which the damper or shutter is mounted,

Figure 5 is a vertical sectional view through the stub pipe adjacent thedamper to show another form of pivot mounting for the damper, and

Figure '6 is an enlarged detail of a portion of the damper with theadjusting mechanism to control the action of the damper.

Referring to the drawings by numerals, like numbers indicating likeparts in the several views, 10 designates a stove pipe or draft line, itbeing here shown as vertically disposed, lwhich is the usual position ofthe pipe, although it will be understood that the regulator isapplicable to pipes otherwise disosed.

p 11 designates a stub pipe, of any suitable or desired length, adaptedto fit over' an opening 12, shown 1n Figures 1 and 3,' in the pipe line,and which may be quickly 10, the stub pipe 11 being provided with ythrough the pipe 10 willV set up a draftv through the stub pipe 11 andopening 12.

It is desirable that the amount of draft coming through the stub pipe 10be automatically regulated, and that such regulation of the draft in thestub pipe 11 be susceptible of adjustment to meet varying conditions.

l In order to secure such automatic regulation, I mount in the bore ofthe stub pipe,

and preferably near the outer end thereof, as shown, a damper orshutter. 15, which will be provided with pivot members 16, and thesepivot members may, of course, take various orms, those shown in Figures1 and 2 being secured by rivets, or'in any suitable manner, directly tothe damper 15, while in Figure 5 the pivots 17 are formed by means ofthe spring member 18, the pivot ends 17 passing through openings in theupset edge of the damper and throughV suitable openings in the.

walls) of the stub pipe. Thedamper 15 swings inwardly tat the bottom onits pivots 16, and will respond to the draft exerted in4 the stub pipe,which draft in the stub pipe will be inwardly, irrespective of thedirection of draft in the pipe 10. A stop 30 is provided along the lowerrim of the stub 1 e. P In order that the resistance of the damper 15 todraft may be regulated, I provide a counterweight 19 secured at theinterconnecting point of a .plurality of links 20, a convenientconstruction being that shown in Figures 4 and 5, where counterweight 19is made up of two hemispherical parts, one on each -side of the links20, with a single pivot pin 21 holding the parts together, butpermitting, of course, free pivoting of the links The links 20 areconstruction here shown comprising the fixed ear 22 on the damper, 15,to which the lower link 2O is connected, andthe movable pivot ear 23, towhich the upper link 2O is connected.

The movable pivot ear 23 is adjustable so as te straighten or collapsethe linkage connection and shift the counterweight 19, the

. tending through the slot 24 in the damper,

which pin is screw-threaded at its end and provided with an adjustablenut 27. A disc or washer 28 is loosely mounted on the pin 26 and bearsagainst the outer face of the damper, a spring 29 being interposedbetween the adjustable thumb nut 27 and the disc 28, so that thelresilient pressure of the spring 2g against the disc 28 may be readilyadj ust-- e With the construction disclosed, and as illustrated inFigures 1 and 2, the counterweight 19 may vbe adjusted, through thelinkage arrangement, from the Y position shown in dot-ted lines inFigure 1, where the counterweight 19 lies substantially in thelongitudinal axial center of the stub pipe 11, to any position ofadjustment between such center position and the range of movement of thepivot member 23, which range of movement is limited only by the lengthof the slot 24, which slot may be of any length desired within thelimits of the diameter of the damper 15. As here shown, the limit of theslot 24, would, of course, be the fixed pivot member 22, but this pivotmember 22 may be secured to the damper at any point between its centerand its periphery, so that the slot 24 could be of any desired lengthwithin' the diameter of the damper, the only limitation being thatadjustment of the linkage arrangement and the weight 19 should not be soextended as to permit the projected weight, as the links 20 arecollapsed, to strike the -wall of the stub 11.

With this arrangement, a very cheap and ellicient constructlon isprovided, for the damper 15 may be stamped up and cut from sheet metal;its attachment to the stub pipe 11 is a simple pivotal attachment; thelinkage arrangement and the combination with the counterweight at theinter-connecting points of the links, and the holding and adjustingelements for varying the spread of the links, is simple and economic-al.It will be observed, further, that the adjusting mechanism for varyingthe position of the counterweight is readily accessible from the outsideof the regulator, and after the,

damper is once hung, it is not necessary to shift the damper bodily,butregulation is secured by merely shifting the counterweight in themanner described. The entire device isimade up as a unit', and whenassembled, may be readily applied by unskilled labor to pipes alreadyinstalled, or may be applied to pipes which are to be set up in a newinstallation, without the necessity of special pipe or joint work inmaking the assembly, the only thing necessary being to make the openingin the draft pi e of the appropriate size to secure the regu ator open.If, after installation, it should, for any reason, be found desirable toeither temporarily or permanently do away with lthe regulator in anyparticular draft pipe, it can be quickly and readily removed, and theopening sealed by proper sealing means, without necessity for skilled-labor or special tools.'

l. An automatic draft regulator comprising a pivotally mounted damper,interconnected link members pivotally connected to the inner side ofsaid damper, a counterweight carried by said interconnected links, andmeans on the outer side of said damper for moving one of said pivotalconnections relative to the other to adjust said interconnected linksand counterweight.

2. An automatic draft regulator comprising a pivotally mounted damperhaving an opening therein, -interconnected links having pivotalconnections with said damper,a counterweight carried by saidinterconnected links, and means operable to move -one -of said pivotalconnections alon the opening in said damper to adjust said links andcounterweight.

3. An automatic draft regulator comprising a pivotally mounted damperhaving a diametrically disposed slot therein, interconnected linkshaving pivotal connections with said damper, a counterweight carried bysaid interconnected links, and means operable to move one of saidpivotal connections along the slot in said damper to adjust said linksand counterweight.

4. An automatic draft regulator comprising a' pivotally mounted vdamperhaving a diametrically disposed slot therein, a pair of interconnectedlinks, a counterweight carried by said interconnected links, a fixedpivot connection on said damper for one of said links, a pivotconnection for the other of said links movablein the slot in saiddamper, and means for moving said movable plvot connection to adju'stsaid links and counterweight.

5. An automatic draft regulator comprising apivotally mounted damperhaving a diametrically disposed slot therein, 'a pair vof interconnectedlinks, a counterweight carried vby said interconnected links, a fixedpivot connection on said damper for one of said links, a pivotconnection for the other of said links movable in the slot of saiddamper, means for moving said movable pivot connection to adjust saidlinks and `counterweight, and resihent means for holding said movablepivot connection in adjusd position. v

6. An automatic draft regulator comprisinsa pvotally mounted damerhaving a su ntially diametrically sposed s ot, interconnected linkmembers on oneside of said damper', a counterweight carried by saidinterconnected links, a fixed pivotal connection for one of said linkson said damper, a pivotal connection for the other of said links movablein the slot in said damper, and means on the other side of said damper`for moving said movable pivot connection in said slot to vary theposition of said interconnected links and said counterweight.

7. An automatic draft regulator comprising Va pivotally mounted damper,relatlvely movable link members havin pivotal connections with the innerside o? said damper, a counterweiht composed of a plurality of partscarrie by said link members,v said parts being equally positioned onboth sides of said link members, and a single pivot pin connecting theends of said lmk members and said counterweight members.

In testimony whereof I have hereunto set my hand.

so RICHARD A.y WALKER.

